Common TCP/UDP Network Ports
| Port ↕ | Protocol | Service ↕ | Description | Category |
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Reserved for system and widely-used services. Require root/admin privileges to bind. Assigned by IANA and universally recognised across operating systems.
Registered by software vendors with IANA for specific applications. Don't require elevated privileges. Used by many popular applications and services.
Assigned automatically by the OS for outbound client connections. Not permanently assigned to any service — used temporarily for the duration of a session.
TCP (Transmission Control Protocol) ensures reliable, ordered delivery — ideal for web, email, and file transfers. UDP (User Datagram Protocol) is faster but connectionless — used for streaming, DNS, and VoIP.